Consulta: subjectFacets:"Forest dynamics"
Registros recuperados: 17
Data/hora: 09/06/2024 12:39:19

WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
Provedor de dados: 73
Autores: Lusk,Christopher H.
Bamboos of the genus Chusquea are aggressive colonisers of tree-fall gaps in the temperate rain forests of southern Chile. Chusquea thickets inhibit regeneration of tree species, suggesting that light levels beneath bamboo-filled gaps may be lower than beneath tall forest. Two LAI-2000 canopy analysers were used to compare diffuse light availability beneath five Chusquea quila thickets and five neighbouring tall forest stands, in a low altitude (&lt;FONT FACE=Symbol&gt;È&lt;/FONT&gt; 400 m a.s.l.) old-growth temperate rain forest in Parque Nacional Puyehue (40º39'S). Leaf area indices (LAI) of these two vegetation phases are also compared. Average diffuse light levels beneath bamboo thickets (1.5 %) were only slightly lower than those beneath tall forest...
Tipo: Journal article
Palavras-chave: Chusquea; Diffuse light; Forest dynamics; LAI-2000; Positive feedback vegetation switch.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003

A simulation of larch forest dynamics associated with fire in northern Mongolia
Provedor de dados: 19
Autores: Taki, S.; Nobori, Y.; Lopez, C.M.L; Takeda, K.; Ishida, S.; Mizota, C.
Palavras-chave: Biomass; Forest dynamics; Larch forest; Tree ring analysis; Yield-Number curve.
Ano: 2013
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3910

Dendrochronology of species from Brazilian Araucaria Forest, Candoi, PR
Provedor de dados: 190
Autores: Mattos, Patricia Póvoa de; Santos, Andreia Taborda dos; Oliveira, Yeda Maria Malheiros de; Rosot, Maria Augusta Doetzer.
In the present work the dendrochronological potential of six species of the Araucaria Forest is analyzed. The trunks of 20 trees were collected in Candoi, State of Parana, Brazil, from an area that belongs toELEJOR, Centrais Elétricas do Rio Jordão, for the following species: Araucaria angustifolia, Clethra scabra, Cedrela lilloi, Ocotea porosa, Podocarpus lambertii and Sebastiania commersoniana (3 to 6, from each species). The trunks were sawed, and at breast height a sample was taken from the center of the board, from bark to bark, crossing the pith, for macroscopic analysis. These samples were dried and polished, making possible the recognition and measurement of growth rings The historical climatic data series were provided by SIMEPAR, the State...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth rings; Precipitation; Temperature; Forest dynamics; Atlantic Rain Forest Anéis de crescimento; Precipitação pluviométrica; Temperatura; Dinâmica de florestas; Mata Atlântica.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/141

Mudanças na florística e estrutura de uma floresta decídua durante um período de quatro anos (1994-1998), na região do Triângulo Mineiro, MG
Provedor de dados: 88
Autores: WERNECK,MÁRCIO DE SOUZA; FRANCESCHINELLI,EDIVANI VILLARON; TAMEIRÃO-NETO,EUGÊNIO.
As alterações na estrutura e na composição florística de um fragmento de floresta decídua foram descritas para um período de quatro anos (1994-1998), na região do Triângulo Mineiro, MG. Este fragmento, denominado Mata da Zilda, foi bastante perturbado por atividades humanas até 1993, sendo protegido a partir de 1994. Logo após a sua proteção, realizou-se um inventário das plantas lenhosas (CAP &gt; ou = 10 cm) em 26 transectos de 50 x 6 m (0,78 ha). Quatro anos depois (1998), todos os transectos foram reavaliados e medidos os novos ingressos. Em 1994, foram identificadas 114 espécies, representando 46 famílias. A riqueza de espécies foi idêntica em 1998. Também, os valores do índice de Shannon (3,72) e a equabilidade (0,79) não diferiram significativamente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest dynamics; Floristics; Structure; Fragment; Dry deciduous forest.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000400006

Tree population and community dynamics in a Brazilian tropical semideciduous forest
Provedor de dados: 88
Autores: Appolinário,Vivette; Oliveira Filho,Ary T.; Guilherme,Frederico A.G.
The dynamics of the tree community and 30 tree populations were examined in an area of tropical semideciduous forest located on the margin of the Rio Grande, SE Brazil, based on surveys done in 1990 and 1997 in three 0.18 ha plots. The main purpose was to assess whether variations in dynamics were related to topography and the effects of a catastrophic flood in 1992. Rates of mortality and recruitment of trees and gain and loss of basal area in two topographic sites, lower (flooded) and upper (non-flooded), were obtained. Projected trajectories of mean and accelerated growth in diameter were obtained for each species. In both topographic sites, mortality rates surpassed recruitment rates, gain rates of basal area surpassed loss rates, and size...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest dynamics; Tree community dynamics; Tree growth; Tree population dynamics; Tropical semideciduous forest.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000200014

Changes in tree species richness, stand structure and soil properties in a successional chronosequence in northern Chiloé Island, Chile
Provedor de dados: 97
Autores: ARAVENA,JUAN C.; CARMONA,MARTÍN R.; PÉREZ,CECILIA A.; ARMESTO,JUAN J.
We studied a chronosequence of forest fragments in northern Chiloé Island, southern Chile, with the aim of assessing ecosystem recovery patterns following anthropogenic disturbance. Hypotheses regarding successional trends in tree species richness, the replacement of shade-intolerant by shade-tolerant species, and the impact of disturbance on soil properties were evaluated in nine forest stands. The chronosequence encompassed two early (minimum stand age &lt;15 years), three mid-successional (30-60 years), three late-successional (129-134 years), and one old-growth stand (ca. 200 years). Stand ages were estimated by coring a minimum of 30 canopy trees in each stand. Early and mid-successional stands showed evidence of human disturbance by fire of moderate...
Tipo: Journal article
Palavras-chave: Forest succession; Fire disturbance; Biodiversity; Shade tolerance; Forest dynamics.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200007

Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
Provedor de dados: 97
Autores: EASDALE,TOMÁS A; SABATÉ,SEBASTIÁN; GRAU,ALFREDO.
Alnus acuminata (Betulaceae) is a pioneer tree that dominates mountain riparian forests throughout the eastern Andes. Early studies associated these forests with particular microclimatic conditions along river beds, but they were later linked to the periodical disturbance regime of mountain rivers. To understand the dynamics of these forests, we analysed tree age and spatial arrangement in two plots along Potrero river and another plot along La Horqueta river, Tucumán Province, north west Argentina. Through intensive tree coring and age reconstruction we identified similar-aged tree cohorts with maximum age ranges of eight years. Tree mapping and Moran's I spatial autocorrelation analysis showed that tree cohorts were spatially clumped, and provided...
Tipo: Journal article
Palavras-chave: Alnus acuminata; River floods; Riparian forests; Forest dynamics; El Niño/ENSO.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400010

"Gaps of deciduousness": cyclical gaps in tropical forests
Provedor de dados: 63
Autores: Gandolfi,Sergius; Joly,Carlos Alfredo; Leitão Filho,Hermógenes de Freitas.
A new concept named "gaps of deciduousness" is introduced for the momentary annual bright places that appear under tropical and subtropical deciduous canopy trees when they are leafless, a cyclical kind of gap totally different from treefall gaps, whose importance in the regeneration ecology of these forests until now had not been discussed or evaluated. The aim of this article is to highlight the most significant aspects related to the concept of "gaps of deciduousness" and suggest the importance of developing studies to evaluate its relevance in the discussion of plant species coexistence and biodiversity maintenance in some tropical forests.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gap dynamics; Forest dynamics; Light regimes; Forest biodiversity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200020

What explains the variation on the regenerative component dynamics of Araucaria Forests in southern Brazil?
Provedor de dados: 63
Autores: Vefago,Manoela Bez; Silva,Ana Carolina da; Cuchi,Tarik; Santos,Guilherme Neto dos; Nunes,Amanda da Silva; Rodrigues Júnior,Luiz Carlos; Lima,Carla Luciane; Gross,Aline; Kilca,Ricardo de Vargas; Higuchi,Pedro.
ABSTRACT: The natural regeneration process is essential for forest maintenance since it is critical for establishing new tree individuals. This study aimed to improve the understanding of the regenerative component dynamics of Araucaria Forests in Southern Brazil. We investigated the effects of climate, light, tree component structure and anthropogenic disturbance on tree species regeneration. Regenerating communities from six different fragments in forest remnants of the “Planalto Sul Catarinense” region was evaluated in permanent plots two years after the first inventory. The following demographic rates were determined: recruitment, mortality, net change in the number of individuals and the changes to both upper and lower height classes. The following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest dynamics; Cattle disturbance; Climatic variables; Mixed ombrophyllous forests.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500405

Growth rate of a terra firme rain forest in Brazilian Amazonia over an eight-year period in response to logging
Provedor de dados: 36
Autores: Carvalho,João Olegário Pereira de; Silva,José Natalino Macedo; Lopes,José do Carmo Alves.
This paper deals with growth rates of trees &gt; 5cm dbh over an eight-year period from 257 species at the Tapajós National Forest. The discussion is centred on the behaviour of the forest after logging. Permanent sample plots were established in 1981 and measured at the first time. The area was logged in 1982. Measurements after logging occurred in 1983, 1987 and 1989. Considering all species together, diameter increment was similar for both intensities of logging until five years after logging. Light-demanding species showed significantly higher growth rates than shade-tolerant species in the logged forest, with greater increment in the heavier treatment intensity. Commercial species also had higher growth rates in the heavier logged area, although those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian forest; Tree growth rate; Diameter increment; Forest dynamics; Logging.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000200009

Changes in the floristic composition of a Terra Firme rain forest In Brazilian Amazonia over an eight-year period In response to logging
Provedor de dados: 36
Autores: CARVALHO,João Olegário Pereira de.
Changes in the floristic composition over an eight-year period in a logged area at the Tapajós National Forest in Brazilian Amazonia arc discussed. Two treatments of different intensities of logging were compared with an undisturbed (control) forest. Data were collected from permanent sample-plots. The effects of logging on floristic composition were stronger in the more heavily logged treatment. The number of species decreased immediately after logging, but started to increase before the fifth year after logging and was higher at the end of the study period than before logging. The more heavily logged plots responded more to disturbances, as judged by the increase in the number of species during the period after logging. This forest appears to recover its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian forest; Floristic composition; Forest dynamics; Logging; Tapajós Forest.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672002000200277

Cost-benefit analysis of industrial and homemade dendrometer bands
Provedor de dados: 39
Autores: Carvalho,Fabrício Alvim; Felfili,Jeanine Maria.
Dendrometer bands are used to make repeated measurements of tree radial growth. Two types of dendrometers are used worldwide, the industrial and the homemade. Homemade dendrometers prevail in Brazilian forestry studies, but researchers have trouble constructing and installing them. An easier solution is to use industrial dendrometer bands, but they are not produced in Brazil and, therefore, are expensive and might not be appropriate for local environmental conditions. We analyzed trunk growth measurements each month (from February 2008 to January 2009) using both industrial (imported) and homemade (national components) dendrometer bands installed on 20 trees of Acacia tenuifolia in a seasonally dry forest on limestone outcrops in central Brazil....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tree growth; Diametric measurements; Repeated measurements; Forest dynamics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000300008

Functional patterns of tree communities in natural Araucaria forests and old monoculture conifer plantations
Provedor de dados: 39
Autores: Malysz,Marcelo; Müller,Sandra Cristina; Milesi,Silvia Vendruscolo; Santos,Anita Stival dos; Overbeck,Gerhard Ernst.
ABSTRACT A functional perspective of tree communities is helpful for understanding forest dynamics, especially vegetation recovery after other land uses. Knowledge about ecological filters and survival strategies of trees are also important for the restoration of degraded areas. This study aimed to evaluate the functional composition and structure of adult and regenerative components of natural Araucaria forests, Araucaria plantations and plantations of exotic Pinus in subtropical southern Brazil. Differences in functional diversity and functional richness, and in community weighted mean trait values, including leaf traits and reproductive traits, were analyzed. RLQ analysis was used to assess the association between community structure, plant traits and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Atlantic Forest; Forest dynamics; Functional diversity; Functional patterns; Pinus sp.; Succession; Tree plantations.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400777

Mortality, recruitment and growth of the tree communities in three forest formations at the Panga Ecological Station over ten years (1997-2007)
Provedor de dados: 39
Autores: Oliveira,Ana Paula de; Schiavini,Ivan; Vale,Vagner Santiago do; Lopes,Sérgio de Faria; Arantes,Carolina de Silvério; Gusson,André Eduardo; Júnior,Jamir Afonso Prado; Dias-Neto,Olavo Custódio.
The area evaluated in this study was a continuous stretch comprising three vegetation formations: gallery forest, semideciduous seasonal forest and cerradão (woodland savanna). The aim of this study was to examine the tree community dynamics in a forest gradient-from gallery forest to cerradão-at Panga Ecological Station, in the city of Uberlandia, located in the state of Minas Gerais, Brazil. The study was based on data from a previous inventory of the continuous forest conducted in 211 permanent 10 × 10 m sample plots in eight parallel transect running perpendicular to Panga Creek. Trees with a diameter at breast height &gt; 4.77 cm were sampled in 1997, 2002 and 2007. With the exception of the cerradão, there was a net reduction in tree density over the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest dynamics; Gallery forest; Semideciduous seasonal forest; Woodland savanna; Savanna.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200010

The population structure of Lonchocarpus cultratus in an Atlantic Forest riparian zone of the upper Paraná River, Brazil
Provedor de dados: 3
Autores: Almeida, Cristina Guilherme de; Souza, Maria Conceição de; Slusarsk, Simone Rodrigues.
The goal of this study was to evaluate the population structure of Lonchocarpus cultratus located in a riparian zone in the flood plain of the upper Paraná River. Data were collected on the stem diameter at breast height (DBH) and the plant height from two phytosociological inventories, which were performed with a 14-year interval, using data collected in studies conducted in 1992 and 2006 in an Atlantic Forest riparian zone remnant of Paraná State, Brazil. Class intervals for DBH and plant height were defined using the Spiegel equation, and the measured values were distributed between the different distinct classes. The distribution of individuals between the different DBH classes was analyzed using de Liocourt’s quotient (q). For both stages of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecologia Diameter structure; Forest dynamics; Forest fragmentation; Recruitment rate Estrutura diamétrica.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/30439

The importance of forest disturbance for the recruitment of the large arborescent palm Attalea maripa in a seasonally-dry Amazonian forest
Provedor de dados: 49
Autores: Salm,Rodolfo.
The hypothesis that forest disturbance is important for the recruitment of the large arborescent palms Attalea maripa was tested with a natural experiment in the Pinkaití site (7º 46'S; 51º 57'W), a seasonally-dry Amazonian forest. A 8,000 m long trail, that crosses, in its lower half, an open forest along the Pinkaití stream bottomlands and, on its upper half, a dense forest on a hill, was divided in 160 0.15 ha (50x30 m) sampling units. At each unit, adult palms were counted and percentage of canopy openness was measured with a concave spherical densiometer. The palms were nearly five times more abundant at the bottomlands, whose forest had a canopy 14.8% more open than that of the hill; supporting the hypothesis that disturbance is important for their...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Attalea maripa; Forest dynamics; Palm trees; Forest regeneration.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000100004

A model for the importance of large arborescent palms in the dynamics of seasonally-dry amazonian forests
Provedor de dados: 49
Autores: Salm,Rodolfo; Jalles-Filho,Euphly; Schuck-Paim,Cynthia.
In this study we propose a model that represents the importance of large arborescent palms in the dynamics of seasonally-dry Amazonian forests. Specifically, the model is aimed at guiding the investigation of the role of large arborescent palms on forest regeneration and succession. Following disturbance, the high level of luminosity reaching recently formed forest gaps favors the quick proliferation of shade-intolerant lianas that, by casting shade on the crowns of mature forest trees and increasing tree-fall probability, suppress forest succession. Due to their columnar architecture palm trees are, however, not severely affected by vines. As the palms grow, the canopy at the gaps becomes gradually higher and denser, progressively obstructing the passage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Attalea maripa; Forest dynamics; Palm trees; Regeneration.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000300011